Completed in about 2 hours, found it absorbing yet slightly tedious but I finished it with the help of the bots. Very little interaction otherwise because I have no idea what the skill tree does and therefore cannot look forward to any of them and will most likely move onto something else before I remember it exists. Unfortunately the nature of the sorting/incremental game is that the user wants the dopamine hit and I can't get that without knowing I'm working towards something.
I gave up on sorting books by anything other than cover appearance for efficiency and because the strain of looking at the little titles/categories was inefficient.
The sorting spell doesn't seem to do anything; nothing was sorted and it didn't feel like it did anything. Neither did the auto-fill button; I didn't realize it even did anything until I was already at the bottom of the pile and could visually see a cue that it was doing something. Because it said that it would auto fill from inventory or a shelf, I filled an adjacent shelf with related books to see if it would trigger once another shelf was filled and it did not. It looks like it only does something once it's upgraded and that is all. Probably wrong but I lost interest in working towards it immediately.
One thing that stood out as a problem was some of the books didn't seem to know what the difference between mythology and religion was. I see kingdom, bunch of books, assume fantasy landscape, therefore books on a temple or about gods should be in the religion section, yes? No, they're myth. I do not know the local lore of the area, so how would I know that? Bit of guessing there.